Split Client interface between Streams and Taps
Implemented Exception propagation to the client
XD-443 Add MQTT Source

Parameters:

clientId (default 'xd.mqtt.client.id' from mqtt.properties)
topics (default 'xd.mqtt.test' from mqtt.properties)

See mqtt.properties for other properties such as broker
url.

To test:

Install RabbitMQ mqtt plugin

'mqtt | log'

Go to rabbit console, find queue 'mqtt-subscription-xd.mqtt.client.idqos1'
and publish a message to it.
XD-447 Add MQTT Sink

Parameters:

clientId (default 'xd.mqtt.client.id.snk' from mqtt.properties (+.snk))
topic (default 'xd.mqtt.test' from mqtt.properties)

See mqtt.properties for other properties such as broker
url.

To test:

Install RabbitMQ mqtt plugin

Create two streams:

'time --interval=5 | mqtt'
'mqtt | log'

Note: mqtt requires unique client ids; the mqtt source has been changed so
that its default clientId is now 'xd.mqtt.client.id.src' from mqtt.properties (+.src)).

XD-447 Add MQTT QOS and Retained Parameters

--qos=   --retained=
Fixing intermittent stest failures
Ditto for taps
XD-374 Add command to list taps

* Add several utility classes for rendering textual contents to the console (E.g. text tables). Migrated from Cloud Foundry Maven Plugin / Hadoop Samples project.
* Align rendering of the Spring XD Shell banner with the Spring Rest Shell
* Add several missing package-info.java files

XD-374 Code review + add tests
XD-466 Add Json support to Tuple
XD-466 - renamed JSon to Json and minor changes per PR review comments
XD-466 - revert build.gradle
XD-476 correct the AbstractRedisRepository to delete the correct key based on the repoPrefix
XD-388 Add webhdfs dependencies to classpath

Add jar files needed to use webhdfs for hdfs sink
Merge branch 'XD-476' of github.com:datianshi/spring-xd into datianshi-XD-476
Merge branch 'XD-466'
Fix Taps to actually use the Resource
renamed JSon to Json...
Implemented Stream listing from Shell (no Pagination yet)
XD-496 - added DefaultTupleConversionService
Merge branch 'XD-496'
XD-469 Upgrading to spring-data-hadoop 1.0.1.RC1